The Taskhostw.exe Miner is a Trojan infection that utilizes a victim’s CPU processing power to mine digital CryptoCurrency called Monero. An autorun will be created called WindowsUpdateChecker that launches updatechecker.exe on login. When executed, this miner will connect to the Monero pool at xmr-eu2.nanopool.org:2828. This causes the CPU utilization to skyrocket up to 100% and stay like that while the process is running.
Source: https://www.bleepingcomputer.com/virus-removal/remove-taskhostw.exe-and-windows-update-checker-miner